I'm leaning towards
https://www.avsecure.com/ mainly because it's free and I have a shit load of UK targeted sites, I'm already moving most of my sites to mojo to make it easier to transition when the time comes. Hopefully though, it's all a load of bollocks and will never work.
Being an affiliate there's no way I can afford to pay for each person to be age checked. I'd be bankrupt within a couple of days.
Also, I'll try and change the sites I can to show no nudity but I'm unsure yet as to what is aloud to be shown, so I'll just wait and see.